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Nanofluidic Detection Platform for Simultaneous Light Absorption and Scattering Measurement of Individual
Yoshiyuki Tsuyama1, Kazuma Mawatari2
1Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan.
Analytical Chemistry
|July 3, 2024
Summary
This study introduces a new nanofluidic platform for simultaneously measuring light absorption and scattering from single plasmonic nanoparticles in flow. The system accurately classifies gold and silver nanoparticles and determines mixture concentrations.
Area of Science:
- Nanotechnology
- Plasmonics
- Analytical Chemistry
Background:
- Single-particle characterization of plasmonic nanoparticles is crucial for applications in diagnostics and therapy.
- Simultaneous measurement of absorption and scattering from individual nanoparticles in flow remains a significant challenge.
Purpose of the Study:
- To develop a novel nanofluidic detection platform for simultaneous measurement of absorption and scattering from individual plasmonic nanoparticles in flow.
- To classify different types of plasmonic nanoparticles and determine their concentrations in mixtures.
Main Methods:
- Utilized a nanofluidic channel for simultaneous optical absorption and interferometric scattering detection of nanoparticles.
- Investigated frequency effects and optimized experimental conditions for enhanced detection performance.
- Employed a Support Vector Machine (SVM) classifier for nanoparticle classification and concentration determination.
Main Results:
- Achieved classification of 20-60 nm gold and silver nanoparticles with 82.6 ± 2.1% accuracy using absorption and scattering data.
- Successfully demonstrated concentration determination of mixed plasmonic nanoparticle samples.
- The platform leverages optical diffraction within the nanochannel for dual readout signals.
Conclusions:
- The developed nanofluidic platform offers a simple yet sensitive method for analyzing plasmonic nanoparticles at the single-particle level.
- This technology has potential applications in chemical and biological assays, advancing nanoparticle analysis.
- The simultaneous measurement capability addresses a key limitation in current nanoparticle detection methodologies.
